fs/ntfs/usnjrnl.h

3  * usnjrnl.h - Defines for NTFS kernel transaction log ($UsnJrnl) handling.
20  * Transaction log ($UsnJrnl) organization:
22  * The transaction log records whenever a file is modified in any way.  So for
28  * The transaction log is in the $Extend directory which is in the root
29  * directory of each volume.  If it is not present it means transaction
30  * logging is disabled.  If it is present it means transaction logging is
34  * To determine whether the transaction logging is enabled or in the process
38  * If the flag VOLUME_DELETE_USN_UNDERWAY is set it means the transaction log
40  * transaction log is enabled.
42  * The transaction log consists of two parts; the $DATA/$Max attribute as well
43  * as the $DATA/$J attribute.  $Max is a header describing the transaction
44  * log whilst $J is the transaction log data itself as a sequence of variable
47  * We do not care about transaction logging at this point in time but we still
48  * need to let windows know that the transaction log is out of date.  To do
49  * this we need to stamp the transaction log.  This involves setting the
54  * The journal_id is as of the current version (2.0) of the transaction log
65  * As an aside, note that to actually disable the transaction log, one would
69  * to delete the transaction log file, i.e. \$Extent\$UsnJrnl, and finally,
72  * Note that if a volume is unmounted whilst the transaction log is being
74  * This is why we can safely mount read-write when we see a transaction log
84  * 32 bytes.  It contains the header describing the transaction log.
92 /*0x10*/sle64 journal_id;	/* Current id of the transaction log. */
159 /*   4*/le16 major_ver;		/* Major version of the transaction log used
161 /*   6*/le16 minor_ver;		/* Minor version of the transaction log used